to be for naught
01
無駄に終わる, 何の効果もない
to completely fail to produce the intended or expected effect
idiom
例
Despite his best efforts, his attempts to reconcile with his estranged friend were for naught.
イベントが中止になって、私たちの準備はすべて無駄に終わった。
無駄に終わる, 何の効果もない